Correct answer: Ra81...c6 2.Rb6# 1...Ra8 2.R:a8#/b:a8Q#/b:a8R# 1.b:c8Q+?? 1...Rb7 2.Ra8#/Q:b7# but 1...N:c8! 1.b:c8B+?? 1...Rb7 2.Ra8#
